Material or immaterial objects belonging to the system context are called system context objects.

Example of system context objects

Materials objects(can be touched)

books

book shelf

student

employee-printer

Immaterial Objects

library database.

Meta- search engine accessing several library system.

user authorization service.

System Context Boundary

Definition

Material and immaterial objects belong to the system context. It thereby separates system context objects from context objects.

3 facets is system context

Subject Facet

Definition

subject facet comprises system context objects about which information is represented in the system.

Example

student.

book

magazine.

IT system facet

Definition

it system facet comprises all system context objects of the technical and operational environment in which the system is going to be deployed in or which influence or constraint the deployment of the system and or the use of technology by the system such as sensors,actuators or other systems.

Example:

printer

server

computer

Usage facets

Definition

usage facet comprises all system context objects which directly or indirectly interact with the system or which influence or benefit from the usage of the system.

Example:

student user group

employee user group

meta-search engine

Documentation of context information

Requirement an context information

Requirement is always defined for a particular context.

A Change in the context typically requires adaptation of requirements.

Documenting context information is a prerequisite for supporting the analysis of the impact of a context change on requirements.